Tread surface of a slip-resistant outsole



FIG. 1 is a perspective view of the present tread surface of a slip-resistant outsole design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a reference front elevational view illustrating an enlarged portion of the tread surface of a slip-resistant outsole thereof;

FIG. 8 is a reference perspective view of the portion seen in FIG. 7 thereof; and,

FIG. 9 is a reference bottom plan view of the portion seen in FIG. 7, the top plan view being a mirror image thereof.

The broken lines in the FIG. 1 through 6 views depict environmental structure that forms no part of the claimed design. The broken lines in the FIG. 7 through 9 views depict the boundaries of the partial views shown in these figures, and also form no part of the claimed design. 

The ornamental design for the tread surface of a slip-resistant outsole, as shown and described. 